7 Dec
2005
7 Dec
'05
8:44 p.m.
So you're saying 2 users at 2 different physical locations with seperate ISP
accounts on the same "Big" internet provider will have the same external
public IP? I have never seen this. Can anyone verify this?
-Sumeet
From: "sip" <sip(a)arcdiv.com>
To: "S G" <skg1010(a)hotmail.com>om>, serusers(a)lists.iptel.org
Subject: Re: [Serusers] How to Minimize rtp proxy usage for all cases
including when behind the same NAT
Date: Wed, 7 Dec 2005 13:36:37 -0500
On Wed, 07 Dec 2005 10:23:38 -0800, S G wrote
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It's pretty simple actually, to determine if
your behind the same
NAT. You just check if the request for both parties are coming from
the same external public IP. Sure, this might not account for every
case, multiple subnets, multiple NAT setups, but it takes care of a
great deal of them. I would say most home users and offices have a
simple single NAT setup. The problem is when using STUN how to set
the SDP's to use the pre-STUN local ip's. Without STUN it works just
fine, but you of course end up rtpproxying ever call.
Multiple NATs are pretty commonplace these days. To discount them as being
unimportant is really a bad idea. MOST big home network providers give
NATted
addresses to their customers... many of whom NAT their own subnets.
N.